High frequency generator circuit



C Dec. 1, 1931. J. R. HARRISON 1,834,154

HIGH FREQUENCY GENERATOR CIRCUIT Filed July 31. 1928 I //4 i 5 7 /0 T E *9 3 1 5 F 5m I I I I I I I I I I I 4 33 INVENTOR.

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BY a w :4TTORNEY Patented Dec. 1, 1931 UNITED STATES JAMIson a. mnmson, or mnnnnrown, CONNECTICUT men mnounncv emrnmron cmcurr Application filed July 31,

My invention relates to high frequency generator circuit arrangements in general and more specifically to circuit arrangements wherein high frequency signalling energy of 5 a substantially constant frequency value is produced. J e

An object of my invention is to provide certain improvements in electron tube circuit arrangements for generating electrical oscil- 1 lations of constant frequency.

Another object of my invention is to provide a balanced vacuum tube circuit arrangement wherein a plurality of vacuum tubes may be employed for producing high fre- 15 quency oscillations of electrical energy. l

Other and further objects of my invention will appear from the specificationto follow and from the accompanying drawing wherein is illustrated the high frequencygenerator 20 circuit arrangement of my invention.

In the accompanying drawing two electron tubes 1 and 2 are represented, each having filament electrodes 3 and 7, control grid elec trodes 4 and 8, shielding grid electrodes 6 25 and 10 and plate electrodes and9. Filament electrodes 3 and 7 areenergized by source 17. Control grid electrodes 4 and 8 are supplied with a source of biasing energy from source 18 through radio frequency choke coils 11 and 12 respectively. Source of energy 19 supplies a positive potential to shielding'grid electrodes 6 and and plate electrodes 5 and 9. Radio frequency choke coil13 excludes radio frequency energy from means may be employed capable of mainsource 19. Inductance 14 and capacity 15- 1928. Serial no. 296,583.

t'ainingoscillations of electrical energy at substantially constantfrequency value. An adjustment d provides means for varying the phase relationship between the two input circuits and two output circuits.

Conductive. members A, B, C. and D are connected to electrodes 4, 8, 5 and 9 respectively. Adjustable contact member provides, means for adjusting the relative posiv tive potential supplied shielding .gridrelec- B0 trodes 6 and 10. a

The control grid 4 and anode 5 of the electron tube 1 are connected to'the conductive members A and C respectively which are ad- 1 jacent to the same face of the piezoelectric 86 element 16. Likewise the conductive members B and D adjacent to the opposite side of the element 16 are connected to the control grid 8 and anode 9 of theelectron tube 2. WVhen a stress is set up in the element 16 70 the resulting polarization induces electrical charges'of opposite sign on the metallic conductive members adjacent to the two opposite faces of the element 16. Conductivemembers A and C, when connected to electrodes 4 and 7 5, will receive charges of the same sign and likewise the conductive members B and D will have charges of likesign but which are opposite in sign to the charges on A and C. When the control grid 4 of vacuum'tube 1 is supplied with a positive potential the control grid 8 of electron tube '2 is supplied with a negative potential. Because of these opposite grid charges, the current in the'anode circuit of electron tubel. will be increasing at the-same time that the current in the anode circuit of tube 2 is diminishing. However, anodes 5 and 9' are connected to the opposite ends of the inductance coil 14 and the direc- I tion of these currents, as illustrated by the arrows 22 in' the output circuit, is such as to produce an additive effect.

It is obvious that many modifications of'the high frequency generator circuit of my invention are possible without departing from the spirit of my invention and it is to be understoodthat my invention is not to be limited to the foregoing specification or to the accompanying drawing but only as definedin the appended claims.

thereof, said conductive members on one side connected to saidgrid and plate electrodes respectively of one branch of said balanced arrangement and said conductive members adjacent the opposite side thereof connected to said grid and plate electrodes respectively of the other branch of said balanced circuit arran ementQ r 2. n a generator of high frequency oscillations, in combination, two thermionic electron tubes each having grid, filament, plate, and shielding grid electrodes, sources of filament potential, plate potential, grid biasing poten tial and shielding grid biasingpotential, a piezo-electric crystal element, two pairs of electrodes spaced from each other and in electrical relation with said piezoelectric crystal, the electrodes constituting a pair being positioned substantially opposite each other, a load connected to said plate electrodes, a balanced circuit system connecting said electrodes in such manner that each electrode of one pair of piezo-electric crystal electrodes is connected to one of said grid electrodes, each electrode of said other. pair of piezo-electric crystal electrodes is connected to one of saidplateelectrodes, said shielding grid electrodes are connected together and to said source of shielding grid biasing potential, and said source of grid biasing potential biases the potential of both of said grid electrodes with reference to both of said filament electrodes. I 3. Ina generator of high frequency oscillations, in combination, a plurality of electron tubes arranged in two symmetrical groups,

each tube having grid, filament, plate, and shielding grid electrodes, sources of filament potential, plate potential, grid biasing potential, and shielding grid biasing potential, a

' piezo-electric crystal element, two pairs of electrodes spaced from each other and in electrical relation with said piezo-electric crystal, the electrodes constituting a pair being positioned substantially opposite each other, a load connected to said plate electrodes, a balanced circuit system connecting said electrodes in such manner that each electrode of one pair of piezo-electric crystal electrodes is connected to the grid electrodes of one of said groups, each electrode of said other pair of piezo-electric crystal electrodes is connected to the plate electrodes of one of said groups, said shielding grid electrodes are connected together and to said source of shielding grid biasing potential, and said source of grid biasing potential biases the potential ofall of said grid electrodes with reference to all of said filament electrodes.

4. In a generator of high frequency oscillations, in combination, a plurality of electron tubes arranged in two symmetrical groups, each tube having grid, filament, plate, and shielding grid electrodes, sources of filament potential, plate potential, grid biasing potential, and shielding grid biasing potential, a piezo-electric crystal element, two

--1'32LlIS1'-0f electrodes, spaced/from each other and in electrical relation with said piezo-electric crystal, the electrodes constituting a pair beingpositioned substantially opposite each other, a load'co'nnected to said plate electrodes, a balanced circuit system connecting said electrodes in such manner that each electrode of one pair of piezo-electric crystal electrodes is connected to the grid electrodes of one of said groups, each electrode of said other pair of piezo-electric crystal electrodes is connected to the plate electrodes of one of said groups, said shielding grid electrodes are connected together and to said source of shielding grid biasingpotential, said source of grid biasing potential biases the potential of all of said gridelectrodes with reference to all of said filament electrodes,-and means for varying thewspacing between said two pairs of piezo-electric crystal electrodes,

whereby theoscillations generated may be controlled,

5. In agenerator of high frequency oscillations, in combination, a plurality of electron tubes arranged in two symmetrical groups, each tube having grid, filament, plate, and shielding grid electrodes, sources of filament potential, plate potential, grid biasing potential, and shielding grid biasing potential, a mechanically vibratile element, two pairs of electrodes spaced from each other and in electrical relation with said mechanically vibratile element, the electrodes constitutingia pair being positioned substantially opposite each other, a load, connected to said plate electrodes, abalanced circuit system connecting said electrodes in such manner that each electrode of one pair of vibratile element electrodes is connected to the grid electrodes of one of said groups, each electrode of said other pair of vibratile element electrodes isconnected to the plate electrodes of one of said groups, said shielding grid electrodes are connected together and to said sourceof shielding grid biasing potential, and. said source of grid biasing potential biases the potential of all of said grid electrodes withreference to all of said filament electrodes.

' 6. Ina generator'ofhigh frequency oscillations, in combination, a plurality of electron tubes arranged in two symmetrical groups, each tube having grid, filament, plate, and shielding grid electrodes, sources of filament potential, plate potential, and

shielding grid biasing potential, a piezo-electrio crystal element, two pairs of electrodes spaced from each other and in electrical relation with said piezo-electric crystal, the electrodes constituting a pair being positioned substantially opposite each other, a load connected to said plate electrodes, a balanced circuit system connecting said eleotrodes in such manner that each electrode of one pair of piezo-electric crystal electrodes is connected to the grid electrodes of one of said groups, each electrode of said other pair of piezo-electric crystal electrodes is connected to the plate electrodes of one of said groups, and said shielding grid electrodes are connected together and to said source of shielding grid biasing potential.

In testimony whereof I afiix my signature.

JAMISON R. HARRISON. 

